"Capacity is 6,500 students throughout the year. It could go up to 8,000 students at any one time."

The Opposition has criticised the Government for securing only a few tenants, but Premier Jay Weatherill says talks are ongoing with a number of businesses keen to establish a presence at the site.

"We have three very important tenants beyond the TAFE College. We have Flinders University and their school of mathematics and science," he said.

"We have Tier 5, a major ICT company which is planning to invest $110 million and of course we have our partner in this site, which is Siemens.

"This could have just ended up as a bulky goods plant but we decided we wanted to use it to transform the South Australian economy."

Opposition looks offshore for export boost

The opening came as the State Opposition unveiled an economic policy of its own, saying it wants to broaden the state's export market to create new jobs.

The Opposition will provide $3,000 dollar grants to up to 500 businesses to take part in trade delegations if it wins the March election.

Opposition Leader Steven Marshall says the policy would help local businesses find new customers in untapped markets.

"I've just come back from South East Asia and it was humiliating to meet with our senior Australian trade officials overseas. They haven't seen anybody from South Australia," he said.

"The Government has dropped the ball in terms of exports and if you think about how we're going to create jobs in South Australia, if you think about how we're going to get our economy going, if you think about how we're going to keep our young people here, you've got to grow the economy.